Media: Remove accents in `sanitize_file_name()`.

This brings some consistency with `sanitize_title()` and `sanitize_user()`.

Props tar.gz, NumidWasNotAvailable, juliobox, p_enrique, cristovaov, zodiac1978, mikeschroder, markoheijnen, chriscct7, swissspidy, DrProtocols, pento, gitlost, joemcgill, dustinbolton, programmin, Vayu, MaximeCulea, lucasbustamante, nilovelez, RavanH, audrasjb, SergeyBiryukov.
See #22363.
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